Line data    Source code

       1             : /******************************************************************************************************
       2             : 
       3             :    (C) 2022-2025 IVAS codec Public Collaboration with portions copyright Dolby International AB, Ericsson AB,
       4             :    Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V., Huawei Technologies Co. LTD.,
       5             :    Koninklijke Philips N.V., Nippon Telegraph and Telephone Corporation, Nokia Technologies Oy, Orange,
       6             :    Panasonic Holdings Corporation, Qualcomm Technologies, Inc., VoiceAge Corporation, and other
       7             :    contributors to this repository. All Rights Reserved.
       8             : 
       9             :    This software is protected by copyright law and by international treaties.
      10             :    The IVAS codec Public Collaboration consisting of Dolby International AB, Ericsson AB,
      11             :    Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V., Huawei Technologies Co. LTD.,
      12             :    Koninklijke Philips N.V., Nippon Telegraph and Telephone Corporation, Nokia Technologies Oy, Orange,
      13             :    Panasonic Holdings Corporation, Qualcomm Technologies, Inc., VoiceAge Corporation, and other
      14             :    contributors to this repository retain full ownership rights in their respective contributions in
      15             :    the software. This notice grants no license of any kind, including but not limited to patent
      16             :    license, nor is any license granted by implication, estoppel or otherwise.
      17             : 
      18             :    Contributors are required to enter into the IVAS codec Public Collaboration agreement before making
      19             :    contributions.
      20             : 
      21             :    This software is provided "AS IS", without any express or implied warranties. The software is in the
      22             :    development stage. It is intended exclusively for experts who have experience with such software and
      23             :    solely for the purpose of inspection. All implied warranties of non-infringement, merchantability
      24             :    and fitness for a particular purpose are hereby disclaimed and excluded.
      25             : 
      26             :    Any dispute, controversy or claim arising under or in relation to providing this software shall be
      27             :    submitted to and settled by the final, binding jurisdiction of the courts of Munich, Germany in
      28             :    accordance with the laws of the Federal Republic of Germany excluding its conflict of law rules and
      29             :    the United Nations Convention on Contracts on the International Sales of Goods.
      30             : 
      31             : *******************************************************************************************************/
      32             : 
      33             : #include <stdint.h>
      34             : #include "options.h"
      35             : #include "ivas_cnst.h"
      36             : #include "ivas_prot.h"
      37             : #include "wmc_auto.h"
      38             : #include <assert.h>
      39             : 
      40             : /*-------------------------------------------------------------------*
      41             :  *  splitAvailableBits()
      42             :  *
      43             :  *  split available bits between channels based on the split ratio
      44             :  *-------------------------------------------------------------------*/
      45             : 
      46      322797 : void splitAvailableBits(
      47             :     const int16_t total_bits,      /* i  : total available bits for TCX coding   */
      48             :     const int16_t split_ratio,     /* i  : split ratio                           */
      49             :     const int16_t isSBAStereoMode, /* i  : signal core coding for SBA            */
      50             :     int16_t *bits_ch0,             /* o  : bits for channel 0                    */
      51             :     int16_t *bits_ch1              /* o  : bits for channel 1                    */
      52             : )
      53             : {
      54      322797 :     assert( split_ratio >= 1 && split_ratio < SMDCT_BITRATE_RATIO_RANGE );
      55             : 
      56      322797 :     *bits_ch0 = split_ratio * total_bits / SMDCT_BITRATE_RATIO_RANGE;
      57             :     /* for SBA mode bias the distribution towards the W channel */
      58      322797 :     if ( split_ratio < 7 && isSBAStereoMode )
      59             :     {
      60      149462 :         *bits_ch0 += (int16_t) ( 0.2 * *bits_ch0 );
      61             :     }
      62      322797 :     *bits_ch1 = total_bits - *bits_ch0;
      63             : 
      64      322797 :     return;
      65             : }